These are directions posted by the members of the Disboutique over on the Disboards. I have compiled them here for easier reference.

Monday, September 8, 2008

Percentages for scaling up a pattern! By CarlaC (LouiesMama)

Origianally posted by CarlaC (LouiesMama)

I was looking at the size charts in my patternmaking textbook, and it seemslike the larger "tween" sizes increase pretty proportionally. I did the mathtoget the differences in the sizes so that the pattern pieces could bescaled upon a copy machine.

to go from an 8 to a 10, scale up103%to go from an 8 to a 12, scale up 106%to go from an 8 to a 14, scaleup 110%to go from a 10 to a 12, scale up 103%to go from a 10 to a 14,scale up 106%to go from a 10 to a 16, scale up 110%

You'll wantto go to a place like Kinko's that has nice machines so you canadjust thescale to whatever you want, and also so you can select a larger papersize(I think you can go up to 11X17 in most machines).I haven't tried thispersonally (I just do the scaling in my drawing program), but these are thepercentages I would use. This should work for most patterns (not just mine)thatare free-fitting like the peasant top/dress. With more fitted styles,keep inmind that as girls develop, the hip/waist ratio changes, and alsothe bustlinechanges. So for something like the a-line, scaling up might notwork. Boys areeasy - they stay pretty much the same until they either getbig muscles or abeer belly !